Which evidence BEST demonstrates an environmental impact on intelligence?
A) A high correlation between the IQ scores of identical twins
B) A low correlation between the IQ scores of strangers
C) The rapid increase in average WISC scores seen during the past 25 years
D) The stability of WISC scores seen during the past 25 years

Question

Quizplus · Accepted Answer

The rapid increase in average WISC (Wechsler Intelligence Scale for Children) scores over the past 25 years suggests an environmental impact on intelligence, as genetic factors would not change significantly in such a short period. This phenomenon, often referred to as the Flynn effect, highlights the role of environmental factors such as education, nutrition, and overall living conditions in influencing intelligence test scores.

Which Evidence BEST Demonstrates an Environmental Impact on Intelligence